it literally states in the manga itself this is seiko minami high school class suirenji kiyoharus account mtf trans total freak and she gets called tranny a ton and misgendered constantly how you read the imgur links i posted it shows exactly why and it this point she doesnt need a backstory chapter and a fan theory that a character might be trans in another series somehow disproves that kiyoharu is trans what i have literally read everything the manga has put out she is trans its not fanon the entity that gave them there wands only gives them to girls and they see there lives in misfortune and then they give them there wands at there lowest point meaning the entity sees her as a girl